Mythical Entrance

Reveal the top X cards of your library. You may put a legendary permanent card with converted mana cost X or less from among them onto the battlefield. Put the rest on the bottom of your library in any order.
Semijikon's forces were unprepared as Calgulum burst through the wall, riding a horse...riding a hydra. Petrified with horrified awe, they were slaughtered before they could even realize that the horse was